System and method for routing a call to a called party&#39;s landline or wireless communication unit

ABSTRACT

A method and system are provided for routing a call to a called party&#39;s landline or wireless communication unit based on the availability of the wireless communication unit A call placed to a called party&#39;s landline communication unit is routed to the called party&#39;s wireless communication unit if the wireless communication unit is determined available, otherwise, the call is routed to the called party&#39;s landline communication unit. Unlike past attempts to facilitate communication with a called party having wireless and landline communication units, these preferred embodiments operate automatically (without called party intervention) before a call is terminated at the landline communication unit and are responsive to the availability of the called party&#39;s wireless communication unit. Further, there preferred embodiments do not rely on complex, predetermined hunting sequences or expensive adjunct customer premises equipment.

TECHNICAL FIELD

[0001] The present invention relates generally to call processing intelecommunication networks and specifically to a system and method forrouting a call to a called party's landline or wireless communicationunit.

BACKGROUND

[0002] Many people have a wireless communication unit, such as acellular phone, in addition to a landline communication unit, such as ahome telephone. While having a home phone and a cellular phone allows aperson to place calls both at and away from home, two phones with uniquephone numbers can make reaching the person difficult. For example, aperson carrying an active cellular phone will miss a call placed to hishome phone.

[0003] Several methods have been suggested to facilitate communicationwith users having wireless and landline communication units. In onemethod, a user forwards calls from his home phone to his cellular phoneby manually entering the cellular phone number into a call forwardingservice. After entry of the cellular phone number, all calls to theuser's home phone are forwarded from the home phone to the user'scellular phone, even if the cellular phone is inactive. In anothermethod, if a call placed to a user's home phone is not answered afterseveral rings, the call is transferred to the user's cellular phone.Because the call is transferred typically after four or five rings, somecalling parties, believing that the call will not be answered, hang upbefore the call is transferred. Other methods rely on complex,pre-determined hunting sequences or expensive adjunct customer premisesequipment.

[0004] There is a need, therefore, for an improved system and method forrouting a call to a called party's landline or wireless communicationunit that will overcome the disadvantages described above.

BRIEF DESCRIPTION OF THE DRAWINGS

[0005]FIG. 1 is an illustration of a wireless communication unit of apreferred embodiment.

[0006]FIG. 2 is a block diagram of a telecommunication system of apreferred embodiment.

[0007]FIG. 3 is a flow chart of a method of a preferred embodiment forautomatically routing a call to a called party's landline or wirelesscommunication unit.

[0008]FIG. 4 is a block diagram of one preferred embodiment of thetelecommunication system of FIG. 2.

[0009]FIG. 5 is a flow chart of a method of a preferred embodiment forautomatically routing a call to a called party's landline or wirelesscommunication unit using the telecommunication system of FIG. 4.

[0010]FIG. 6 is a flow chart of a method of a preferred embodiment fordetermining whether a called party's wireless communication unit isavailable.

DETAILED DESCRIPTION OF THE PRESENTLY PREFERRED EMBODIMENTS

[0011] By way of introduction, the preferred embodiments described belowinclude a method and system for routing a call to a called party'slandline or wireless communication unit based on the availability of thewireless communication unit. In one embodiment, a call placed to acalled party's landline communication unit is routed to the calledparty's wireless communication unit, such as a cellular phone 100 (FIG.1), if the wireless communication unit is available. Otherwise, the callis routed to the called party's landline communication unit. Unlike pastattempts to facilitate communication with a called party having wirelessand landline communication units, these preferred embodiments operateautomatically (without called-party intervention) before a call isterminated at the landline communication unit and are responsive to theavailability of the called party's wireless communication unit. Further,there preferred embodiments do not rely on complex, pre-determinedhunting sequences or expensive adjunct customer premises equipment.

[0012] Turning again to the drawings, FIG. 2 is a block diagram of atelecommunication system 200 of a preferred embodiment. As shown in FIG.2, a calling party 210 is coupled with a called party's landlinecommunication unit 220 and wireless communication unit 230 throughwireless and landline communication networks 240. As used herein, theterm “coupled with” means directly coupled with or indirectly coupledwith through one or more components. The wireless and landlinecommunication networks 240 comprise computer usable medium having first,second, and third computer readable program codes 250, 260, 270 embodiedtherein. It is important to note that while the program codes 250, 260,270 have been shown as three separate components, their functionalitycan be combined and/or distributed. It is also important to note that“media” is intended to broadly cover any suitable media, analog ordigital, now in use or developed in the future.

[0013] The telecommunication system 200 of FIG. 2 can be used in amethod for automatically routing a call to a called party's landline orwireless communication unit, as shown in the flow chart of FIG. 3. Whenthe calling party 210 places a call to the called party, the firstcomputer readable program code 250 automatically determines theavailability of the called party's wireless communication unit 230 (step310). In response to the called party's wireless communication unit 230being determined unavailable, the second computer readable program code260 automatically routes the call to the called party's landlinecommunication unit 220 (step 320). In response to the called party'swireless communication unit 230 being determined available, the thirdcomputer readable program code-270 automatically routes the call to thecalled party's wireless communication unit 230 (step 330).

[0014]FIG. 4 is a block diagram of one preferred embodiment 400 of thetelecommunication system 200 of FIG. 2. This preferred system 400comprises a landline communication unit 410 coupled with a wirelesscommunication unit 420 through a signal switching point (SSP) 430, atandem switch 440, a signal transfer point (STP) 450, a service controlpoint (SCP) 460, a mobile switching center (MSC) 470, and a homelocation register (HLR) 480. This system 400 embodies an intelligentbridge between components used in wireless and landline networks. TheMSC 470 and the HLR 480 are components used in a wireless network. TheMSC 470 handles switching and routing to the wireless communication unit420, and the HLR 480 is a database that stores information about thelocation of the wireless communication unit 420.

[0015] The other components of the system 400 communicate voice and datatraffic and network signaling protocols that control switching of thevoice and data traffic The SSP 430 is a central office equipped withAdvanced Intelligent Network (AIN) software, which enables the SSP 430to suspend call processing and launch a query to the SCP 460 via the STP450. The SCP 460 handles queries sent from the SSP 430 by communicatingwith HLR 480, although any database that contains the informationdescribed below can be used. Preferably, communication between the SCP460 and the HLR 480 is carried out through a Signaling System 7 (SS7)network using IS-41 Transaction Capabilities Applications Protocol(TCAP) Rev. B protocol. The SSP 430 also communicates voice and datatraffic to the MSC 470 via the tandem switch 440.

[0016] In this embodiment, the SSP 430 is associated with the calledparty's landline communication unit 410 and receives a call from acalling party. Because the SSP 430 is associated with the called party,it is referred to as a terminating SSP. It should be understood that anSSP associated with the calling party (an originating SSP) can bemodified to perform the functions described below. It is important tonote that the SSP 430 can transfer voice and data traffic directlywithout the use of the tandem switch 440 and can directly transfernetwork signaling protocols to the SCP 460 without the use of the STP450. Also, a central office not equipped with an SSP can be providedwith software to send messages to the SCP 460 in an AIN-query format.Preferably, the SCP 460 utilizes a service order interface to create anautomated message account (AMA) billing record to charge for calls thatare routed using the method described below.

[0017]FIG. 5 is a flow chart of a method of a preferred embodiment forautomatically routing a call to a called party's landline or wirelesscommunication unit 410, 420 using the preferred system 400 of FIG. 4.First, the SSP 430 receives the called party's destination number (DN)from the calling party (step 510). In this preferred embodiment, thecalled party's DN is the DN associated with the called party's landlinecommunication unit 410. A terminating attempt trigger (TAT) at the SSP430 recognizes the called party's DN, and the SSP 430 suspends the calland launches a terminating attempt query to the SCP 460 (step 520).Preferably, this query follows the form shown in Appendix A.

[0018] Next, the SCP 460 determines whether the wireless/landlinerouting service is active (step 530). If the wireless/landline routingservice is deactive, the SCP 460 responds to the query from the SSP 430with a message authorizing termination to the called party's landlinecommunication unit 410 (preferably in the form shown in Appendix B), andthe SSP 430 routes the call to the landline communication unit 410 (step540). If the wireless/landline call routing service is active, the SCP460 determines whether the calling party is using the wirelesscommunication unit 420 (step 550). This determination can be made, forexample, by analyzing the DN of the calling party identificationparameter in the AIN query. If the calling party is using the wirelesscommunication unit 420, it is preferred that the call be routed to thecalled party's landline communication unit 410 (step 540) to avoidautomatically routing the call back to the wireless communication unit420 itself (i.e., to prevent circular routing).

[0019] If the calling party is not using the wireless communication unit420 (or if the SCP 460 cannot make the determination), the SCP 460determines whether the called party's wireless communication unit 420 isavailable (step 560). The preferred execution of this step is shown inthe flow chart of FIG. 6. First, SCP 460 sends a location request to theHLR 480 of the MSC 470 (step 610). It is preferred that the locationrequest follow the form shown in Appendix C. Upon receiving the request,the HLR 480 determines the routing address of the wireless communicationunit 420 and sends a response containing the routing address, ifavailable, to the SCP 460 (step 620). If no response is received by theSCP 460 after an elapsed period of time, the SCP 460 preferablyauthorizes the SSP 430 to terminate the call to the called party'slandline communication unit 410 (step 630). If the response contains therouting address of the wireless communication unit 420 and does notindicate that the wireless communication unit 420 is inactive (e.g., ifthe “access denied” field is populated by any value except “2”(inactive)), the SCP 460 sends a forward call command to the SSP 430(step 640), and the call is routed through the MSC 470 to the wirelesscommunication unit 420 (step 570). A preferred response format from theHLR 480 is shown in Appendix D, and a preferred forward call commandformat is shown in Appendix E.

[0020] If the response indicates that the wireless communication unit420 is not registered with the HLR 480 or is inactive (see the preferredresponse in Appendix F) the SCP 460 sends the SSP 430 a messageauthorizing termination to the called party's landline communicationunit 410, preferably in the form shown in Appendix G (step 650). The SSP430 then routes the call to the landline communication unit 410 (step540).

[0021] It is possible that a call routed to an active wirelesscommunication unit 420 will go unanswered. Such a call can be handled bythe logic in the MSC 470 (e.g., termination of the call, transfer tovoice mail, call forward to another number, etc.).

[0022] To prevent circular routing of calls, it is preferred that thecalling party DN be changed to the DN of the wireless communication unit420 for calls routed to the wireless communication unit 420. In thisway, if, for example, the MSC 470 is programmed to forward unansweredcalls to the landline communication unit 410, the automaticlandline/routing feature described above will not re-route the call tothe wireless communication unit 420 (see step 550 above).

[0023] It is also possible that a call routed to an active wirelesscommunication unit 420 will terminate on a busy line. As describedabove, the MSC 470 can transfer such a call to the voice-mail systemassociated with the wireless communication unit 420. A called party,however, may not be aware of the need to check that voice-mail system Toavoid this problem, a unified voice-mail system can be used to handlecalls from both the wireless communication unit 420 and the landlinecommunication unit 410. In this way, a user can check the voice-mailsystem associated with the landline communication unit 410 and receivemessages left by callers who were routed to the wireless communicationunit 420.

[0024] In the above-described preferred embodiment, the availability ofthe wireless communication unit 420 was based on whether the wirelesscommunication unit 420 was active. In an alternative embodiment,availability is additionally based on whether the wireless communicationunit 420 is busy. In this embodiment, the SCP 460 authorizes the SSP 430to route the call to the wireless communication unit 420 only if theunit 420 is both active and not busy.

[0025] While the number of the called party's landline communicationunit 410 was used in the above-described preferred embodiments totrigger a query, a number not associated with either the called party'slandline or wireless communication unit can be used to trigger thequery. Also, a query can be triggered when a calling party dials thenumber of the called party's wireless communication unit 420. As oneexample of this alternative embodiment, a call to the placed wirelesscommunication unit 420 can be automatically forwarded by the MSC 470 tothe SSP 430, which launches a query as described above. Of course, if acall is placed to the non-triggering number, the call will be directlyconnected to that communication unit. For example, in the embodimentillustrated in FIG. 5, a call to the wireless communication unit 420will be directly connected to that unit 420.

[0026] In another alternative embodiment, if a call is routed to thecommunication unit that is not associated with the number called by thecalling party, an indication can be generated by that communicationunit. For example, if a calling party dials a number for the calledparty's landline communication unit and if the call is routed to thecalled party's active wireless communication unit, a distinctive ring,such as a multiple ring, can be generated by the wireless communicationunit. In contrast, a call directly terminated to the wirelesscommunication unit can have a single ring. In this way, a called partycan monitor the ring pattern of a communication unit to determinewhether the incoming call is a direct or routed call. Of course, otherkinds of indications, such as a visual indication, can be generated.

[0027] As mentioned in the discussion above with reference to FIG. 5, itis possible to deactivate the wireless/landline call routing service.One way of engaging or disengaging the service is through an interactivevoice response (IVR) unit. A called party can disengage the service ifhe does not want to be disturbed by or incur the expense of a routedcall. One way in which to deactivate the wireless/landline call routingservice is to engaging an unconditional call forwarding feature.

[0028] As another alternative, the SCP 460 can instruct the SSP 430 toplay a message to the calling party while waiting for a response fromthe HLR 480. This message can alert the calling party that the call isbeing processed, providing the advantage of alerting the calling partythat the call is being processed despite a delay, which can occur, forexample, if the called party is roaming between MSCs.

[0029] For simplicity, the term “landline communication unit” isintended to broadly cover any communication unit that receives callsfrom a calling party through a physical connection from a main switchpoint, such as a central office. Landline communication units include,but are not limited to home or office telephones, fax machines, andmodems. Also for simplicity, the term “wireless communication unit” isintended to broadly cover any communication unit that receives callsfrom a calling party through a wireless, over-the-air connection.Wireless communication units preferably include, but are not limited to,cellular phones, mobile phone, paging devices, and modems adapted toreceive wireless transmissions, although personal communication service(PCS) devices can also be used. Wireless communication units can use anywireless communication technology including, but not limited to, analogwith enhanced registration, time division multiple access (TDMA), codedivision multiple access (CDMA), and global system multiple (GSM)technology, as well as radio, infrared, and satellite transmissions.

[0030] It is intended that the foregoing detailed description beunderstood as an illustration of selected forms that the invention cantake and not as a definition of the invention. It is only the followingclaims, including all equivalents, that are intended to define the scopeof this invention.

What is claimed is:
 1. A method for routing a call to a called party's landline or wireless communication unit, said method comprising the steps of (a) automatically determining an availability of a called party's wireless communication unit; then (b) automatically routing a call to a called party's landline communication unit in response to the called party's wireless communication unit being determined unavailable in step (a); and (c) automatically routing the call to the called party's wireless communication unit in response to the called party's wireless communication unit being determined available in step (a).
 2. The method of claim 1 further comprising the step of automatically routing the call to the called party's landline communication unit in response to a calling party using the called party's wireless communication unit.
 3. The method of claim 1, wherein step (a) comprises the step of automatically determining an availability of a called party's wireless communication unit in response to receiving, from a calling party, a destination number associated with the called party's landline communication unit.
 4. The method of claim 1, wherein step (a) comprises the step of automatically determining an availability of a called party's wireless communication unit in response to receiving, from a calling party, a destination number associated with the called party's wireless communication unit.
 5. The method of claim 1, wherein step (a) comprises the step of automatically determining an availability of a called party's wireless communication unit in response to receiving, from a calling party, a destination number independent of a number associated with either the called party's wireless or landline communication unit
 6. The method of claim 1, wherein step (a) comprises the step of (a1) sending a location request to a home location register; and (a2) analyzing a response to the location request.
 7. The method of claim 1, wherein step (b) comprises the step of automatically routing a call to a called party's landline communication unit in response to the called party's wireless communication unit being determined inactive, and wherein step (c) comprises the step of automatically routing the call to the called party's wireless communication unit in response to the called party's wireless communication unit being determined active.
 8. The method of claim 1, wherein step (b) comprises the step of automatically routing a call to a called party's landline communication unit in response to the called party's wireless communication unit being determined busy, and wherein step (c) comprises the step of automatically routing the call to the called party's wireless communication unit in response to the called party's wireless communication unit being determined not busy.
 9. The method of claim 1 further comprising the step of providing the called party's wireless communication unit with an indication that a call is automatically being routed to the called party's wireless communication unit.
 10. The method of claim 1 further comprising the step of providing the called party's wireless communication unit with a distinctive ring in response to automatically routing the call to the called party's wireless communication unit. 11 The method of claim 1 further comprising the step of playing a message to a calling party before the call is automatically routed. 12 The method of claim 1 further comprising the step of using an interactive voice response system to disable performance of steps (a)-(c)
 13. The method of claim 1 further comprising the step of using a voice-mail system to receive messages from the landline communication unit and the wireless communication unit.
 14. A system for routing a call to a called party's landline or wireless communication unit, said system comprising: first means for automatically determining an availability of a called party's wireless communication unit; second means for automatically routing a call to a called party's landline communication unit in response to the called party's wireless communication unit being determined unavailable; and third means for automatically routing the call to the called party's wireless communication unit in response to the called party's wireless communication unit being determined available.
 15. A system for routing a call to a landline or wireless communication unit, said system comprising: a service control point operative to automatically determine an availability of said wireless communication unit in response to a query; and a signal switching point coupled with the service control point, the signal switching point being operative to send said query to the service control point, automatically route a call to said landline communication unit in response to said wireless communication unit being determined unavailable, and automatically route a call to said wireless communication unit in response to said wireless communication unit being determined available.
 16. The invention of claim 15 further comprising a database, coupled with the service control point, comprising availability information of said wireless communication unit
 17. The invention of claim 16, wherein the database comprises a home location register.
 18. The invention of claim 15, wherein the signal switching point is operative to automatically route a call to said landline communication unit in response to said wireless communication unit being determined inactive and operative to automatically route a call to said wireless communication unit in response to said wireless communication unit being determined active.
 19. The invention of claim 15, wherein the signal switching point is operative to automatically route a call to said landline communication unit in response to said wireless communication unit being determined busy and operative to automatically route a call to said wireless communication unit in response to said wireless communication unit being determined not busy.
 20. The invention of claim 15, wherein the signal switching point is operative to send said query to the service control point in response to receiving a destination number of said landline communication unit.
 21. The invention of claim 15, wherein the signal switching point is further operative to provide said wireless communication unit with an indication that a call is automatically being routed to the called party's wireless communication unit.
 22. The invention of claim 15, wherein the signal switching point is further operative to play a message to a calling party while awaiting a response from the service control point.
 23. The invention of claim 15 further comprising a voice-mail system coupled with the signal switching point and operative to receive messages from said landline communication unit and said wireless communication unit
 24. The invention of claim 15 further comprising an interactive voice response system coupled with the signal switching point and operative to deactivate a transmission of said query to the service control point.
 25. A computer usable medium having computer readable program code embodied therein for routing a call to a called party's landline or wireless communication unit, the computer readable program code comprising: first computer readable program code for automatically determining an availability of a called party's wireless communication unit; second computer readable program code for automatically routing a call to a called party's landline communication unit in response to the called party's wireless communication unit being determined unavailable; and third computer readable program code for automatically routing the call to the called party's wireless communication unit in response to the called party's wireless communication unit being determined available. 